I have _not_ tested on an old kernel but using 2.6.35 from Maverick on Lucid does not have any visible regressions.
$ lsb_release -rd Description: Ubuntu 10.04.1 LTS Release: 10.04
$ uname -a Linux simon-laptop 2.6.35-22-generic #33~lucid1-Ubuntu SMP Sat Sep 18 12:23:52 UTC 2010 x86_64 GNU/Linux
I have _not_ tested on an old kernel but using 2.6.35 from Maverick on Lucid does not have any visible regressions.
$ lsb_release -rd
Description: Ubuntu 10.04.1 LTS
Release: 10.04
$ uname -a
Linux simon-laptop 2.6.35-22-generic #33~lucid1-Ubuntu SMP Sat Sep 18 12:23:52 UTC 2010 x86_64 GNU/Linux